forked from luck/tmp_suning_uos_patched
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
97 lines
2.8 KiB
C
97 lines
2.8 KiB
C
/*
|
|
* BRIEF MODULE DESCRIPTION
|
|
* Simple Au1000 clocks routines.
|
|
*
|
|
* Copyright 2001 MontaVista Software Inc.
|
|
* Author: MontaVista Software, Inc.
|
|
* ppopov@mvista.com or source@mvista.com
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the
|
|
* Free Software Foundation; either version 2 of the License, or (at your
|
|
* option) any later version.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
|
|
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
|
|
* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
|
|
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
|
|
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with this program; if not, write to the Free Software Foundation, Inc.,
|
|
* 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <asm/mach-au1x00/au1000.h>
|
|
|
|
static unsigned int au1x00_clock; // Hz
|
|
static unsigned int lcd_clock; // KHz
|
|
static unsigned long uart_baud_base;
|
|
|
|
/*
|
|
* Set the au1000_clock
|
|
*/
|
|
void set_au1x00_speed(unsigned int new_freq)
|
|
{
|
|
au1x00_clock = new_freq;
|
|
}
|
|
|
|
unsigned int get_au1x00_speed(void)
|
|
{
|
|
return au1x00_clock;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* The UART baud base is not known at compile time ... if
|
|
* we want to be able to use the same code on different
|
|
* speed CPUs.
|
|
*/
|
|
unsigned long get_au1x00_uart_baud_base(void)
|
|
{
|
|
return uart_baud_base;
|
|
}
|
|
|
|
void set_au1x00_uart_baud_base(unsigned long new_baud_base)
|
|
{
|
|
uart_baud_base = new_baud_base;
|
|
}
|
|
|
|
/*
|
|
* Calculate the Au1x00's LCD clock based on the current
|
|
* cpu clock and the system bus clock, and try to keep it
|
|
* below 40 MHz (the Pb1000 board can lock-up if the LCD
|
|
* clock is over 40 MHz).
|
|
*/
|
|
void set_au1x00_lcd_clock(void)
|
|
{
|
|
unsigned int static_cfg0;
|
|
unsigned int sys_busclk =
|
|
(get_au1x00_speed()/1000) /
|
|
((int)(au_readl(SYS_POWERCTRL)&0x03) + 2);
|
|
|
|
static_cfg0 = au_readl(MEM_STCFG0);
|
|
|
|
if (static_cfg0 & (1<<11))
|
|
lcd_clock = sys_busclk / 5; /* note: BCLK switching fails with D5 */
|
|
else
|
|
lcd_clock = sys_busclk / 4;
|
|
|
|
if (lcd_clock > 50000) /* Epson MAX */
|
|
printk("warning: LCD clock too high (%d KHz)\n", lcd_clock);
|
|
}
|
|
|
|
unsigned int get_au1x00_lcd_clock(void)
|
|
{
|
|
return lcd_clock;
|
|
}
|
|
|
|
EXPORT_SYMBOL(get_au1x00_lcd_clock);
|